1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
#include <sys/poll.h>
#include <sys/signalfd.h>
#include <err.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define die(...) err(EXIT_FAILURE, __VA_ARGS__)
#define lengthof(a) (sizeof(a) / sizeof(*(a)))
static char buf[4096];
int
main(void)
{
sigset_t set;
sigemptyset(&set);
sigaddset(&set, SIGINT);
sigaddset(&set, SIGQUIT);
sigprocmask(SIG_BLOCK, &set, NULL);
int fd = signalfd(-1, &set, 0);
if (fd == -1)
die("signalfd");
struct pollfd fds[] = {
{.fd = fd, .events = POLL_IN},
};
for (;;) {
if (poll(fds, lengthof(fds), -1) == -1)
die("poll");
if (fds[0].revents & POLL_IN) {
fputs("Caught signal!\n", stderr);
read(fds[0].fd, buf, sizeof(buf));
}
}
return EXIT_SUCCESS;
}
|
